Similar species: Philadelphus coronarius and Philadelphus pubescens both have fragrant flowers in clusters of five or more. Philadelphus floridus has hairy sepals and densely hairy lower leaf surfaces.

Flowering: May to June

Habitat and ecology: Introduced from the southeastern United States. In the Chicago Region, an escape was found in dry, disturbed woods along a right-of-way. In its native range, this species usually grows in the mountains along streambanks and moist hillsides or cliffs.

Occurence in the Chicago region: non-native

Etymology: Philadelphus is named after a Greek king, but also means "brotherly love." Inodorus means unscented.